Send to KSeF

Requirements

Before sending an invoice, ensure that:

• ✅ You have an active KSeF session (green icon in the side panel).
• ✅ Company data (seller) is completed in Settings.
• ✅ The invoice has passed validation (summary step with no errors).

Submission Process

1. In the invoice creator, go to Step 5 (Submission).
2. Click the Send to KSeF button.
3. Wait for the response — the application will display:
   • ✅ KSeF Number — the unique invoice identifier.
   • ✅ Status — confirmation of acceptance.

After Submission

Upon successful submission:

• The invoice will appear on the invoice list after synchronization.
• The next invoice number will be automatically incremented.
• You can issue another invoice or return to the list.

Submission Errors

Most common causes of errors:

Error	Cause	Solution
Session expired	KSeF token has become invalid	Click Authorize in KSeF in settings
Validation error	The XML does not pass KSeF validation	Check the data in the summary step
Network error	No connection to the KSeF server	Check your connection and try again

tip

If the session expires during submission, the application will automatically attempt to renew the token.